REF02

7

SBVS003B

www.ti.com

OUTPUT ADJUSTMENT

The REF02 trim terminal can be used to adjust the voltage

over a 5V

±150mV range. This feature allows the system

designer to trim system errors by setting the reference to a

voltage other than 5V, including 5.12V(1) for binary applica-

tions (see circuit on page 1).

Adjustment of the output does not significantly affect the

temperature performance of the device. The temperature

coefficient change is approximately 0.7ppm/

°C for 100mV of

output adjustment.

NOTE: (1) 20mV LSB for 8-bit applications.

TYPICAL APPLICATIONS

5k

Ω

OPA177

10k

Ω

10k

Ω

–15V

+15V

–5V

+5V

Trim

GND

V

IN

35

4

2

REF02

0.1

µF

V

O

Temp

6

FIGURE 2.

±5V Precision Reference.

REF02

GND

2

4

–18V

+18V

V

IN

FIGURE 1. Burn-In Circuit.

REFERENCE STACKING

PROVIDES OUTSTANDING LINE REGULATION

By stacking two REF01s and one REF02, a systems designer

can achieve 5V, 15V, and 25V outputs. One very important

advantage of this circuit is the near-perfect line regulation at

5V and 15V outputs. This circuit can accept a 27V to 55V

change to the input with less than the noise voltage as a

change to the output voltage. R

B, a load bypass resistor,

supplies current I

SY for the 15V regulator.

Any number of REF01s and REF02s can be stacked in this

configuration. For example, if ten devices are stacked in this

configuration, ten 5V or five 10V outputs are achieved. The

line voltage may range from 100V to 130V. Care should be

exercised to insure that the total load currents do not exceed

the maximum usable current, which is typically 21mA.